Nullification is the act of cancelling something.

无效是取消某事的行为

But this nullification does not affect the validity of the entire air transport contract.

但是，此种条款的无效，不影响整个航空运输合同的效力。

How can a western President, like the French President, ask for nullification of Iranian election results?

一位像法国总统这样的西方总统怎么可以要求取消伊朗的选举结果？

The nullification system of insurance contract is not quite perfect in the insurance law of our country.

在我国保险法中，保险合同的无效制度不很完善。

How can a Western President, like the French President, ask for nullification of Iranian election results?

怎么能西方的总统，如法国总统，要求废除选举结果，伊朗？

Finally let us consider a case in which the opponent is downed by the nullification of his resistance to gravity.

最后，让我们考虑一个案件中，对手是被击落通过废止他的抵抗重力。